org.geotools.referencing.wkt

Class AbstractConsole

Object

AbstractConsole

All Implemented Interfaces:

Runnable

Direct Known Subclasses:

Console

public abstract class AbstractConsole
extends Object
implements Runnable

Base class for application performing operations on WKT objects from the command line. Instructions are usually read from the standard input stream and results sent to the standard output stream, but those streams can be redirected. The set of allowed instructions depends on the subclass used.

Since:

2.1

Author:

Martin Desruisseaux (IRD)

Field Summary

Fields

Modifier and Type	Field and Description
protected PrintWriter	err The error stream, usually the standard one.
protected LineNumberReader	in The input stream, usually the standard one.
protected String	lineSeparator The line separator, usually the system default.
protected Writer	out The output stream, usually the standard one.
protected Format	parser The WKT parser, usually a Preprocessor object.

Constructor Summary

Constructors

Constructor and Description
AbstractConsole(Format parser) Creates a new console instance using standard input stream, standard output stream, error output stream and the system default line separator.
AbstractConsole(Format parser, LineNumberReader in) Creates a new console instance using the specified input stream.
AbstractConsole(Format parser, LineNumberReader in, Writer out, PrintWriter err, String lineSeparator) Creates a new console instance using the specified streams and line separator.

Method Summary

Modifier and Type	Method and Description
void	addDefinition(String name, String value) Adds a predefined Well Know Text (WKT).
protected abstract void	execute(String instruction) Execute the specified instruction.
void	executeAll() Executes all instructions (like run()), but stop at the first error.
String	getPrompt() Returns the command-line prompt, or null if there is none.
void	loadDefinitions(LineNumberReader in) Load all definitions from the specified stream.
Object	parseObject(String text, Class type) Parses the specified text.
void	printDefinitions() Prints to the output stream a table of all definitions.
protected void	reportError(Exception exception) Print an exception message to the standard error stream.
void	run() Process instructions from the input stream specified at construction time.
void	setPrompt(String prompt) Set the command-line prompt, or null for none.
void	stop() Stops the run() method.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

in

protected final LineNumberReader in

The input stream, usually the standard one.

out

protected final Writer out

The output stream, usually the standard one.

err

protected final PrintWriter err

The error stream, usually the standard one.

lineSeparator

protected final String lineSeparator

The line separator, usually the system default.

parser

protected final Format parser

The WKT parser, usually a Preprocessor object.

Constructor Detail

AbstractConsole

public AbstractConsole(Format parser)

Creates a new console instance using standard input stream, standard output stream, error output stream and the system default line separator.

Parameters:

parser - The WKT parser, usually a Preprocessor object.

AbstractConsole

public AbstractConsole(Format parser,
                       LineNumberReader in)

Creates a new console instance using the specified input stream.

Parameters:

parser - The WKT parser, usually a Preprocessor object.

in - The input stream.

AbstractConsole

public AbstractConsole(Format parser,
                       LineNumberReader in,
                       Writer out,
                       PrintWriter err,
                       String lineSeparator)

Creates a new console instance using the specified streams and line separator.

Parameters:

parser - The WKT parser, usually a Preprocessor object.

in - The input stream.

out - The output stream.

err - The error stream.

lineSeparator - The line separator.

Method Detail

parseObject

public Object parseObject(String text,
                          Class type)
                   throws ParseException,
                          FactoryException

Parses the specified text. The default implementation delegates the work to the parser.

Parameters:

text - The text, as a name, a WKT to parse, or an authority code.

type - The expected type for the object to be parsed (usually a CoordinateReferenceSystem.class or MathTransform.class).

Returns:

The object.

Throws:

ParseException - if parsing the specified WKT failed.

FactoryException - if the object is not of the expected type.

addDefinition

public void addDefinition(String name,
                          String value)
                   throws ParseException

Adds a predefined Well Know Text (WKT). The value argument given to this method can contains itself other definitions specified in some previous calls to this method. This method do nothing if the parser is not an instance of Preprocessor.

Parameters:

name - The name for the definition to be added.

value - The Well Know Text (WKT) represented by the name.

Throws:

IllegalArgumentException - if the name is invalid.

ParseException - if the WKT can't be parsed.

loadDefinitions

public void loadDefinitions(LineNumberReader in)
                     throws IOException,
                            ParseException

Load all definitions from the specified stream. Definitions are key-value pairs in the form name = wkt (without the SET keyword). The result is the same than invoking the SET instruction for each line in the specified stream. This method is used for loading predefined objects like the database used by PropertyAuthorityFactory.

Parameters:

in - The input stream.

Throws:

IOException - if an input operation failed.

ParseException - if a well know text (WKT) can't be parsed.

printDefinitions

public void printDefinitions()
                      throws IOException

Prints to the output stream a table of all definitions. The content of this table is inferred from the values given to the addDefinition(java.lang.String, java.lang.String) method. This method print nothing if the parser is not an instance of Preprocessor.

Throws:

IOException - if an error occured while writting to the output stream.

getPrompt

public String getPrompt()

Returns the command-line prompt, or null if there is none.

setPrompt

public void setPrompt(String prompt)

Set the command-line prompt, or null for none.

run

public void run()

Process instructions from the input stream specified at construction time. All lines are read until the end of stream ([Ctrl-Z] for input from the keyboard), or until stop() is invoked. Non-empty and non-comment lines are given to the execute(java.lang.String) method. Errors are catched and printed to the error stream.

Specified by:

run in interface Runnable

executeAll

public void executeAll()
                throws Exception

Executes all instructions (like run()), but stop at the first error.

Throws:

Exception - if an instruction failed.

execute

protected abstract void execute(String instruction)
                         throws Exception

Execute the specified instruction.

Parameters:

instruction - The instruction to execute.

Throws:

Exception - if the instruction failed.

stop

public void stop()

Stops the run() method. This method can been invoked from any thread. If a line is in process, it will be finished before the run() method stops.

reportError

protected void reportError(Exception exception)

Print an exception message to the standard error stream. The error message includes the line number, and the column where the failure occured in the exception is an instance of ParseException.

Parameters:

exception - The exception to report.